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| title | Import the COUNT library into your project |
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See Import a Library if you need a refresher on how to do it. |
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| title | Create a custom number field called 'NextId' and set it to the value 156 in your card |
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NextId
First, in config.json add your Custom Fields. Then go to your component card and set the value to 156.
Note: You’ll need to change your component to use the DEVELOPMENT commit to see the newly added custom field. See Choosing the code to run for your component.  |
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| title | COUNTset("NextId", NextId) is how we set the count value |
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COUNTset saves the new value of the custom field in the custom field value file. | Code Block |
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| COUNTset("NextId", NextId) |
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titleThis means we can see the NextId in the card view of the component - and we can set it too! |
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| title | To test this, we can set the component to run every 2 seconds using component.setTimer{delay=} |
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You can use component.setTimer{} is used here to run main every 2 seconds. This is a complete little program to increment a custom number field: | Code Block |
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require "COUNT.COUNT"
function main(Data)
--Poll the component every 2 seconds
component.setTimer{delay=2000}
local NextId = COUNTget("NextId")
NextId = NextId+1
COUNTset('NextId', NextId)
end |
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| title | Run the component from the component |
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| .setTimer{} is used here to run main every 2 seconds. | card view and see the NextId value change. |
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| title | The COUNT library solves this problem by giving a convenient interface to get and set a custom field value |
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Remember, the Custom Fields values are stored on disc in JSON. This means we can load and save them programmatically. This is how this library works. |
This is a very useful pattern for lots of Feeder interfaces. It’s used as part of the IMAP Email Feed component.